package cn.beeson.gatewaydemo.conf;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.loadbalancer.core.RandomLoadBalancer;
import org.springframework.cloud.loadbalancer.core.ReactorLoadBalancer;
import org.springframework.cloud.loadbalancer.core.ServiceInstanceListSupplier;
import org.springframework.cloud.loadbalancer.core.ServiceInstanceListSupplierBuilder;
import org.springframework.cloud.loadbalancer.support.LoadBalancerClientFactory;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.core.env.Environment;

public class CustomLoadBalancerConfiguration {

    /**
     * 权重轮询策略
     * @param context   context
     * @return  ServiceInstanceListSupplier
     */
    @Bean
    public ServiceInstanceListSupplier discoveryClientServiceInstanceListSupplier(
            ConfigurableApplicationContext context) {

        return ServiceInstanceListSupplier.builder()
                .withDiscoveryClient()
                .withWeighted()
                .withCaching()
                .build(context);
    }

    /**
     * 随机轮询策略
     * @param environment   environment
     * @param loadBalancerClientFactory loadBalancerClientFactory
     * @return  ReactorLoadBalancer<ServiceInstance>
     */
//    @Bean
    ReactorLoadBalancer<ServiceInstance> randomLoadBalancer(Environment environment,
                                                            LoadBalancerClientFactory loadBalancerClientFactory) {
        String name = environment.getProperty(LoadBalancerClientFactory.PROPERTY_NAME);
        return new RandomLoadBalancer(loadBalancerClientFactory
                .getLazyProvider(name, ServiceInstanceListSupplier.class),
                name);
    }

}
